location of the measurement points for the installed
diesel generator should be coordinated with the
SAFETY RUN TEST paragraph. Modify the radial
distance requirement from the engine,exhaust, and
air-intake to account for obstructions, variations
in site conditions, building configurations or
indicate points on the contract drawings at which
measurements are to be made.
**************************************************************************
The noise generated by the diesel generator set operating at 100 percent
load shall not exceed the following sound pressure levels in any of the
indicated frequencies when measured in a free field at a radial distance of
22.9 feet 7 meters at 45 degrees apart in all directions.
Frequency Band
Maximum Acceptable
(Hz)
Pressure Level
(Decibels)
31
[____]
63
[____]
125
[____]
250
[____]
500
[____]
1,000
[____]
2,000
[____]
4,000
[____]
8,000
[____]
The noise generated by the installed diesel generator set operating at 100
percent load shall not exceed the following sound pressure levels in any of
the indicated frequencies when measured at a distance of [22.9] [_____] m
[75] [_____] feet from the end of the exhaust and air intake piping
directly along the path of intake and discharge for horizontal piping; or
at a radius of [22.9] [10.7] [_____] m [75] [35] [_____] feet from the
engine at 45 degrees apart in all directions for vertical piping.
Frequency Band
Maximum Acceptable
(Hz)
Pressure Level
(Decibels)
31
[____]
63
[____]
125
[____]
250
[____]
500
[____]
1,000
[____]
2,000
[____]
4,000
[____]
8,000
[____]
2.7
AIR INTAKE EQUIPMENT
Filters and silencers shall be provided in locations that are convenient
for servicing. The silencer shall be of the high-frequency filter type,
SECTION 16263A
Page 46
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